With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipCfgPeerIndex
Cisco Sip Configure Peer Index
1.3.6.1.4.1.9.9.152.1.1.4.1.1.1
An arbitrary index that uniquely identifies a dial-peer configured for SIP.
Back to CISCO-SIP-UA-MIB MIB page.
IPHost Network monitor allows you to monitor cSipCfgPeerIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.